Simulation on flow rate characteristics of gas fire extinguishing agent with expansion nozzle based on AMESim

摘要

In this study, AMESim software was used to simulate the process of halon 1301 fire extinguishing agent discharged from expansion nozzle, and the influence of nozzle outlet cross-sectional area, nozzle length and different expansion types of nozzles on the flow rate at the nozzle outlet were analyzed. The result shows that the outlet flow rate of the sudden expansion nozzle is less affected by the length of the nozzle, and the maximum flow rate at the outlet decreases with the increase of the outlet cross-sectional area. From the gained data, in the range of 0°∼45°, the maximum outlet flow rate of the progressive expansion nozzle decreases with the increase of the outlet cross-sectional area and increases with the increase of the nozzle length. When the outlet cross-sectional area and nozzle length of the two nozzles are both the same, the maximum outlet flow rate of the progressive expansion nozzle is larger than that of the sudden nozzle, and the difference between them decreases as the expansion angle increases when the outlet cross-sectional area is constant.